Hitachi Metals, Ltd.

Yasuhiko Ohtsubo

Shunji Okazaki

Hirohisa Suwabe

A ceramic honeycomb structure having porous cell walls defining large numbers of flow paths, the cell walls having porosity of 55-70%, an average pore diameter of 10-40 &#x3bc;m, a concave area ratio CR (projected area ratio of portions lower than an average surface determined from cell wall surface roughness by a least square method) of 0.32-0.6, and an average concave depth H(average depth of portions lower than the average surface) of 0.02-0.1 mm.

Ceramic honeycomb structure and method for producing ceramic honeycomb structure

A method for producing a ceramic honeycomb filter having large numbers of flow paths partitioned by cell walls, the flow paths having plugs at positions separate from an end surface of the honeycomb filter, comprising the steps of introducing a base-forming material into the flow paths on one end surface side, charging a plug-forming material into flow paths to be provided with plugs from the other end surface side, and sintering it.

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Miyako-gun, Japan

Yasuhiko Ohtsubo